// JavaScript Document
function setFontByTag(e, v) {
	var elements = document.getElementsByTagName(e);
	for(var i = 0; i < elements.length; i++) {
		elements.item(i).style['fontSize'] = v;
		}
	}
	
function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name)
{
	createCookie(name,"",-1);
}
function changeSize(inc) {
	var sizes = new Array('0.9', '1', '1.1', '1.2', '1.3');
	var si = 1;
	if(readCookie('fs')) { si = parseInt(readCookie('fs')); }
	if (!document.getElementsByTagName) {return false;}
	if (inc == '1') { 
		si+=1;
		if (si>4) si=4;
		}
	else if (inc == '-1') { 
		si-=1;
		if (si<0) si=0;
		}
	setFontByTag('td', sizes[si]+'em');
	createCookie('fs',si,30);
	}
	
function init() {
	if(readCookie('fs')) { var si = parseInt(readCookie('fs')); }
	if (!document.getElementsByTagName) {return false;}
	if(typeof(si) == "undefined"){si =0;}
	var sizes = new Array('0.9', '1', '1.1', '1.2', '1.3');
	setFontByTag('td', sizes[si]+'em');
	}
	
function resetSize() {
	setFontByTag('td', '0.9em');
	eraseCookie('fs');
	}